Metallic packing



Aug. 23, 1932. J. F. ENDERLN ET AL METALLIC PACKING Filed NOV. 1'7. 1950 JFEnJer/z'n y JE. Oyles Patented Aug. 23, 1932 i M EF,i ATESQ PAT NT oFFicE or :romv r. mtemm Ann zrosnrn 15:. cents, or ranucan, KEN UCKY METALLIC PACKING Application filed November" 17; 1930; Serial no. 496,230.

This invention relates to a metallic packing particularly adapted for use in connection with reciprocating rods'working under presv sure, such as the piston rods of locomotives and air compressors, the plungers of certain types of pumps, and the like.

The primary object of the invention is to provide, in a manner as hereinafter set forth, a metallic packing which is automatically adjustable in order that wear thereon will be taken up, thereby insuring a proper fit at all times, and preventing leakage around the rod with which the packing is used.

A further object of the invention is to provide a packing of the character aforesaid which may be formed of cast iron, thereby materially reducing the cost of construction and providing a packing adapted to with stand high temperature, whereby better lubrication may be maintained.

With the foregoing and other objects in view, the invention consists of the novel construction, combination and arrangement of parts as hereinafter more particularly described, and as illustrated in the accompany ing drawing wherein is shown an embodiment of the invention, but it is to be understood that the description and drawing are to be taken as illustrative and that the invention is intended to be limited only by the scope of the claims hereunto appended.

In. the accompanying drawing in which like numerals are employed to designate like parts throughout the several views:

Figure l is a longitudinal section through a packing in accordance with this invention showing the same applied to a piston rod and cylinder head.

Figure 2 is a section taken on the line 2-2 of Figure l.

Figure 3 is a fragmentary elevation showing the segmental rings of the packing in connection with a piston rod.

Figure 4 is a diagrammatical view illustrating the manner in which wear is taken up in the segments of the rings.

Referring to the drawing in detail the numeral 1 indicates a housing for our metallic packing, the housing as shown being connected by means of a plurality of suitable between the segments is disposed in parallel bolts 2 with a cylinder head 8 having an opeiiing 4 through which a piston rod extends, the piston rod"5 further extending'throug'h an opening 6 in the housing 1.

The packing includes a pair of rings 7, each 5 consisting of a plurality of segments 8, in the present instance three in number. Theinner face 9 of each of the segments constitutes an arc which conform'sto the periphery of the rod 5 when the segments 8 are assembled thereon. The outer peripheral face 10 of each of the segments 8 is eccentric to the inner peripheral face 9 whereby each segment gradually decreases in thickness from one end 11 thereof towards the opposite end 12 thereof. The segments 8 are assembled with the end face at the larger end of each segment 7 in abutment with the end. face or the smaller end of an adjacent segment. Each joint'13 70 relation to animaginary llne 14 drawn dlametrically through the piston rod and also through the inner end of the next adjacent joint located in the direction of increasing thickness of-the segments. i

The segments 8 of eaohring 7 are main tained inassembled relation by means ofan endless spring 15 which encircles the segments and is seated within a groove 16 formed in the outer peripheral faces of the segments. The oints13 between the segments of one of the rings 7- are disposed in staggered relation with respect to the joints 13 in the other ring 7 'Owingto the gradually decreasing thickness of each of the segments from one end thereof to the other, the spring 15 exerts a greater pressure on the larger end por tions of the segments, substantially no pres sure at all being exerted on the smaller end portions thereof. Interposed between the innermost ring Tand the cylinder head 3 is a suitable washer 17,"and interposed between the outer ring 7 and the outer wall 18 of the housing l'is a similar washer 19.

.In Figure 4 the segments of one of the rings are shown in full lines in the positions'which' they assume when first assembled with respect to the pistonrod 5. As the segments become worn in use, the inner peripheral faces thereof will be maintained in engagement with the piston rod by the action of the spring 15. The spring 15 will continue to take up wear on the inner faces of the segments until the outer peripheral faces of the segments present a circle as indicated by the dotted line 20, after which the pressure of the spring 15 on the segments will be equal throughout the length of the segments and no further wear can be taken up. The maximum amount of wear which can be taken up by the action ofthe spring 15 is indicated at 21 in Figure 4:- During the taking up of the wear on the inner faces of the segments, there is a slight pivotal movement of the latter about the smaller ends thereof whereby the joints 13 will be moved to the positions indicated at 22 when maximum wear of the segments has been taken up. Owing to the staggered relation of the joints of one ring with respect to the joints of the other ring, the pressure of the segments of the two rings is substantially equal throughout the circumference of. the piston rod. 7

It is thought that the many advantages of a metallic packing in accordance with this invention will be readily apparent, and althoughthe preferred embodiment of the invention is as illustrated and described, it is to be understood that changes in the size, shape and arrangement of parts may be resorted to, so long as such changes fall within the scope of the invention as defined in the appended claims.

What we claim is 1. A metallic packing comprising, a split annular metallic member formed of three segments of like form shifta-ble relatively to each other and each gradually increasing in width from one end to the other, the smallest end edge of one segment slidably abutting the largest end edge of an adjacent segment, the inner lengthwiseedges of said segments being of curved contour and coacting to provide a circle, one section having the termini of its inner lengthwise edge registering with a terminus of the inner lengthwise edge of each of the other of said sections, said sections having the outer lengthwise edges thereof eccentrically curved with respect to and of greater length than said inner lengthwise edges, each segment having its outer lengthwise edge terminating at the outer ends of the end edges of the segment, the end edges of each segment being disposed at opposite inclinations with respect to each other, and tensioning means encompassing-said member and seated against the major portion of the outer lengthwise edge of each segment.

2. A metallic packing comprising, a split annular metallic member formed of three segments of like form shiftable relatively to each other and each gradually increasing in width from one end to the other, the smallest end edge of one segment slidably abutting the largest end edge of an adjacent segment, the inner lengthwise edges of said seg ments being of curved cont-our and coacting to provide a circle, one section having the termini of its inner lengthwise edge registering with a terminus of the inner lengthwise edge of each of the other of said sections, said sections having the outer lengthwise edges thereof eccentrically curved with respect to and of greater length than said inner lengthwise edges, each segment having its outer lengthwise edge terminating at the outer ends of the end edges of the segment, and tensioning means encompassing said member and seated against the major portion of the outer lengthwise edge of each segment.

In testimony whereof, we aflix our signatures hereto.

JOSEPH E. OGLES. JOHN F. ENDERLIN. 

